Why do hockey goalies hit the net posts with their stick?

It's usually a pre-game of a post-game ritual for a lot of the goalies as a thank you or a good job kind of thing. Marc-andre fleury for example gave the net posts a nice rub after the other team tried to score and the puck bounced off the post. It was so say 'thanks' or 'good job' Mostly just a ritual. Plus it looks pretty awesome :)